Studies on the Crosslinking Reaction of Cellulose Fiber with Bis-isocyanatoalkyl Disulfides and Improvement of the Crease Recovery

셀룰로오스 섬유와 Bis-isocyanatoalkyl Disulfide와의 가교반응 및 방추성 개선에 관한 연구

The cease recovery of cellulose fiber was improved by treating with disulfide diisocyanates. Thus far, bis-β-isocyanatoethyl disulfide (BIED) has been used for the crosslinking agent. In this work, two new crosslinking agents, bis-γ-isocyanatopropyl disulfide (BIPD) and bisisocyanatomethyl disulfide (BIMD), were synthesized from γ,γ'-dithiodibutyric acid and dithiodiacetyl dihydrazide, respectively. Cotton cellulose was treated in dimethylacetamide solution with BIPD, BIMD, and BIED, and then reduced with tri-n-butyl-phosphine. The crosslinking efficiencies (crosslinks/total diisocyanate combined) of these fibers were calculated from the nitrogen contents determined by Kjeldahl method before (total diisocyanate combined) and after reduction. Changes in breaking strength and crease recovery were also investigated.